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Sure thats easy to explain, and its not magic at all.
> What I don’t quite get is how this applies to equities, leveraged trading schemes
Equities, and the stock exchange as a whole, is just investment vehicles. Its an open public marketplace that allows for investors to invest in a company in exchange for ownership. When you buy stock you put more money in the pockets of the company through multiple mechanisms, this in turn enables the company to have the resources to generate more wealth (produce more products for example) and thus produces wealth. Over time as wealth increases the price of stocks increase along with it usually (though its based on perception so the real price and the market price may be mismatched at times)
> ... and accumulating real estate
Real estate is different but similarly easy to explain. Land has wealth based on its utility. Maintained land is more wealth the same land that isnt maintained since it has more utility if it can be used than if it cant. So by investing in infrastructure, or even just managing the land so it has trails all increase wealth through land ownership. Even if you buy the land pre-developed because physical assets like building slowly degrade (thus causing destruction of wealth) the constant input to maintain it effectively creates wealth (though only just offsetting the wealth being destroyed).
Moreover even unmaintained land can change in wealth based on what it is around. A piece of land on its own int he middle of a dense forest has less wealth (use) than the same plot of land that is accessible and next to a road. Also lots of smaller plots of land have less wealth (utility) than those same plots of land as one large plot. So even just buying land in an area from many different owners to collectively make them a single plot of land will add wealth.
